import { type CSSProperties } from 'react';
/**
 * Convert CSS width value to number (in pixels).
 * Currently supports number values and pixel strings (e.g., '300px').
 * Percentage strings (e.g., '50%') are not supported yet.
 *
 * @param value - CSS width value (number or string)
 *
 * @param propName - Name of the prop for error messages (optional)
 *
 * @returns Number value in pixels
 *
 * @throws Error if value is undefined or invalid
 */
export declare function parseSizeToNumber(value: CSSProperties['width'], propName?: string): number;